Schottky Diode Working and Applications
Schottky Diode Working and Applications Introduction: ďƒ˜ Schottky diode is one type of electronic component, which is also known as a barrier diode. It is widely used in different applications like a mixer, in radio frequency applications, and as a rectifier in power applications. It’s a low voltage diode. In This presentation, we discusses about what is a Schottky diode, construction, applications, characteristics and advantages.
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Schottky Diode Working and Applications What is a Schottky Diode? ďƒ˜ Thus creating a Schottky barrier. ďƒ˜ The N-type semiconductor acts as a cathode and the metal side acts as the anode of the diode.
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Schottky Diode Working and Applications What is a Schottky Diode?
A Schottky diode is also known as a hot carrier diode.
It’s a low voltage diode.
Schottky diode the voltage drop normally ranges between 0.15 and 0.45volts.
This lower voltage drop provides higher switching speed and better system efficiency.
In Schottky diode, a semiconductor–metal junction is formed between a semiconductor and a metal. http://www.elprocus.com/
Schottky Diode Working and Applications Schottky Diode Construction It is a unilateral junction. A metal semiconductor junction is formed at one end and another metal semiconductor contact is formed at the other end. It is an ideal Ohmic bidirectional contact with no potential existing between the metal and the semiconductor. Schottky diode is a function of temperature dropping. It decreases and increasing temperature doping concentration in N type semiconductor.
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Schottky Diode Working and Applications Schottky Diode Construction ďƒ˜ Metals of the Schottky barrier diode like molybdenum, platinum, chromium, tungsten Aluminium, gold, etc., are used and the semiconductor used is N type.
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Schottky Diode Working and Applications Schottky Barrier Diode A Schottky barrier diode is also known as Schottky or hot carrier diode. A Schottky barrier diode is a metal semiconductor. A junction is formed by bringing metal contact with a moderately doped N type semiconductor material. The Schottky barrier diode is a unidirectional device conducting current flows only in one direction.
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Schottky Diode Working and Applications Schottky Barrier Diode
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Schottky Diode Working and Applications V-I Characteristics Of Schottky Barrier Diode ďƒ˜ The V-I characteristics of a Schottky barrier diode are below
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Schottky Diode Working and Applications V-I Characteristics Of Schottky Barrier Diode The forward voltage drop of the Schottky barrier diode is very low compared to a normal PN junction diode. The forward voltage drop ranges from 0.3 volts to 0.5 volts. The forward voltage drop of Schottky barrier is made up of silicon. The forward voltage drop increases at the same time increasing the doping concentration of N type semiconductor. The V-I characteristics of a Schottky barrier diode are very steeper compared to the V-I characteristics of normal PN junction diode due to the high concentration of current carriers. http://www.elprocus.com/
Schottky Diode Working and Applications Current Components in Schottky Diode The Schottky barrier diode current condition is through majority carriers. Which are electrons in an N type semiconductor. The formula in the Schottky barrier diode is
IT= IDiffusion+ ITunneling+ IThermionic emission
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Schottky Diode Working and Applications Current Components in Schottky Diode IDiffusion is diffusion current due to concentration gradient and diffusion current density.
Jn=Dn*q*dn/dx for electrons. Where Dn is the diffusion constant of electrons. q is electronic charge = 1.6*1019coulombs dn/dx is a concentration gradient for electrons.
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Schottky Diode Working and Applications Current Components in Schottky Diode ITunneling is the tunneling current due to quantum mechanical tunneling through the barrier. The probability of tunneling increases with the decrease in the barrier or built in potential and decrease in depletion layer width. This current is directly proportional to the probability of tunneling.
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Schottky Diode Working and Applications Current Components in Schottky Diode IThermionic Emission is a current due to thermionic emission current. Due to thermal agitation, some carriers have equal energy to or larger than the conduction band energy to the metal-semiconductor interface, and to the current flow. This is known as thermionic emission current. Since the current flowing direction through the Schottky barrier diode is through majority charge carriers.
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Schottky Diode Working and Applications Current Components in Schottky Diode ďƒ˜ It is suitable for high-speed switching applications ďƒ˜ because the forward voltage is very low and the reverse recovery time is very short.
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Schottky Diode Working and Applications Applications Of Schottky Diode Schottky diodes are used for the voltage clamping applications. Used to prevention of transistor saturation due to the high current density in the Schottky diode. It’s also be a low forward voltage drop in Schottky diode. It t is wasted in less heat, making them an efficient choice for applications that are sensitive and very efficiency. Schottky diodes are also used as rectifiers in power supplies.
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Schottky Diode Working and Applications Advantages Of Schottky Diode Schottky diodes are used in many applications compare to other types of diodes that do not perform well. Low turn on voltage: The turn on voltage for the diode is between 0.2 and 0.3 volts. For a silicon diode it is against 0.6 to 0.7 volts from a standard silicon diode. Fast recovery time: A fast recovery time means a small amount of stored charge that can be used for high speed switching applications. Low junction capacitance: It occupies a very small area, after the result obtained from wire point contact of the silicon. Since the capacitance levels are very small. http://www.elprocus.com/
Schottky Diode Working and Applications Features Of Schottky Diode The features of Schottky diode mainly include the following Higher efficiency. Low forward voltage drop. Low capacitance. Low profile surface-mount package, ultra-small. Integrated guard ring for stress protection.
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Schottky Diode Working and Applications Conclusion ďƒ˜ This is all about Schottky Diode Working and its working principle and applications. We have seen its construction, Schottky barrier diode , V-I Characteristics Of Schottky barrier diode.
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